I'm confused, does this mean I can now hack my psp 3000 with firmware 6.00? So I can run homebrew games? Or is this something different?

This is something different. It allows you to decrypt the PSP firmware for 6.00 , 6.10 , and 6.20. This will make it easier to look for new exploits though. Also the keys for 5.05 and 5.50 are wrong.. whoever updated it before just used the 5.00 key even though the key changed.